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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe55a4bbbc6a4c0e85c7ca96657264315c9fb94a4c14bf66b2e6319581a561' 
  AND token = 'UA42qrutTUWs2m9luCNnHVryWvPEGH/naCh78urglVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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