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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e44e5e434592fec17f778c71caab7ba0603a75d5c10d5c8f0e1bc606806c211' 
  AND token = 'SGjdZbxZ1X7rJH5+zoPxO6GjWICX1rI1nqyhBCKF0q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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