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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dae93dc62ef7a6db4b8c41044fdd536162944361b4c37ab3e6f03cbd1fc3645' 
  AND token = 'J+UEbsOSYGUbTmVeQFSfcYiN9KPqigoa8FS+XING1v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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