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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a3347ee8afe69e168cd4e89f263f6e38869e383b89ef72e652dda6d775b221' 
  AND token = 'gi/KMyaIsJNRofM9gBfQv7ndCxTCWv2fy+IVp6kGFhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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