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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8a4703bd033adf1b41317edbb3077bfcabb483fbd9e89d469c8e58f5e5b487' 
  AND token = 'aZlJVRISpu5KQtsFS25DQfgVIgmpHA0ZC+N+Z9U5E6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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