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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea12483d17c4b076e474b295cb7bb12e1ee9887ad60d650ae51624375e0c9e77' 
  AND token = 'efeNqTGOKhlN+bpCMXGrbAjRmT+H0VShUAQtu6TPXXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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