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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a58a5efb45fa5362059f86eda1bd114987b409c2c3fc95e7b6d80004df91b36' 
  AND token = '9CAd7d+HoTmN7iK3S/tXqMeeKlehCOSnmRJFXe1UZLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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