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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8870ab7d392a03212e20ea85a7531b49584f20033961cb6bba9059ad21e9d5a' 
  AND token = 'pHBSz3upZ/EWvJhAJDHR1E0QJQAcQBra59gVBLuEPyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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