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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d1bbb3aea3e70585cf5d2c66ce586a8b5187637695affe8b7b2d08f5793a67' 
  AND token = 'itn6BLXm0CM9sp4F1cEtBfX8iH06bFMk65ZKqYuq0Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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