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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a46323ae492baa4ef4d548fdd3f5b2cc6dbed1ac345feacc690d68f44e1ba0' 
  AND token = 'uz8DQKuTM5J3IZjxiYcox+0emGOXjc7O1czI5K1AIoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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