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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a128602eddd40de37dc37be91e4ed97030ad1a6aeb079d96d16787598e32d5be' 
  AND token = 'Andej1RfqEqiPB+liYyn+68Ae5U9GlOS5nYT6D6J1uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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