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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df515ca7bc7671e9297cbd61b57459930e864ceffe84b198e1db9d50c30f42a2' 
  AND token = 'DlMddaW8CaSINMcFtIsLKzbS0fw57nY0ge702StRHy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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