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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc35a148a5961d6afd464fc34793c903b4403d179a1cede30174bd91d11b654' 
  AND token = 'WCVbK5t3G8D7S4RJaBFfBZpk6HORhgeHge++2Lyq1SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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