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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574627629a6ef5d383b149452344f96d13173808e2db3729e744542837abd966' 
  AND token = 'U8rBYEj5WtznRxNgARFqWtp1WRhEtHEfOIj4HPczl5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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