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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d26f15f1f1b747600253367c4be56c2b8cafae6f354a2b024683e04e0def7fe' 
  AND token = 'JACDPvyeVQsfU5KmX034mkUYK0o203DcvIYxNtG2cLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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