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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35acc13f0d1a938ff89378e8f96d2a6b458d876eb0a06bb0f82748b5b3ff8e59' 
  AND token = 'sJnFvUE5XNmfNkXn+GipgFUg7PY2X8t9W3a4c6L90yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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