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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f00a924cacab0c18e9c8a129a8a571954a0494382092d0166e4423e59ac5332' 
  AND token = '+mgVaZxrnauJERw9KD+3AQsVmL7i6tBeZI8UjD7lz7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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