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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2ccf0ce732be5c93ae656c13fabc91f792aa09bc816574738977c89381248d' 
  AND token = 'KyFsVSwJ+gqkY5TQD69ngrQgix8qF6ynG0vbcrWH+T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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