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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565028a5cb627d292580c07bf7bca32acb7ac319a46e5b14530b4357ef9c3dfd' 
  AND token = 'E4uRN5Ug9TWHGr+McCbccaBtbzChr6eGnOM3ZvSPrMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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