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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5571c282885ad1fe4ba00cf4f4518e80f911072ad9b4b1a80a672f011843ce68' 
  AND token = 'fLRxAxaT//2bNJXUlzl6yqNXOz8D9Oy7eWT1cD3S3co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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