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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6889d7900b8cbd730a652b137aab33a220cca69a499b2041685693db0053e14c' 
  AND token = 'cG86KHjsj5hOLhGgYEAXgz4lEGoJfO74kMJ3W2p56lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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