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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383ef056b705170bc6c73626bbaba3d178992a2c5971e15753349d1aaeee6052' 
  AND token = 'NsiF49ouqImgaTIrKRoWcNBh3B7mPK6iIW0XqmdwR0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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