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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348a28904afa4851aaa3014b720f8746d8905e863c5a7c9cca4200a8fa09b45e' 
  AND token = '3DE8s4fXRTI9Cv3W8OFptMN1PJaYUN77jeMPX/2ghNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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