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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b8a750db2c12a0fb0bb0fbf6cedd7669661346dee2cdf2d0361bc0ac8ea93c' 
  AND token = 'HJt5UM4LpwrC9Y/h6STTJOPOxJtuim2wBYQ/HyhMjAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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