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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd03bc806112d0c98b92f1a936ed977639287c0b064ca7ab1e420fc790e3ae6' 
  AND token = 'Wxy2Xbs2w3iHLlwhtZ/z4KSn7L4AKoHrVaA9LSvUKB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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