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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d43f888ef02cce8ca355f6c93c4e07aa9b878700d38c1f947a77bd5cb514c4' 
  AND token = 'i57/pidwYIobL7rW/tIroec+vYFlYHtP1VtBuQaC9/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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