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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575b18cc1e264cae07a137fad002044a73cafe004f0aadb047cf040293a7fea2' 
  AND token = 'CiQOVBCO9Z7M48SB0sMWfg9pLAaeScmz4VVjiWVq55Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}