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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1ff3126743dd315982ac8b06696f11c392ba0b175e1552a73490b70510902f' 
  AND token = 'M0IdBzc5xVOe2uxlX0ofIKeHrtboKQUW1vjX6xM8f7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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