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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c304b3681a74db0d4edc5ef767d055c288de7abd984d1148077924a752c16f' 
  AND token = 'eByRM0V4chxJXxmqhSevWA3Xq/WXDxRVW/k5MfN3fWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00286

JSON explain

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