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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87648e1a11e155930d6d0ec7ca11250fa2cb1085657766bc155c7a32ed17e0c1' 
  AND token = '7j7LpzfDodp+yn1cthSEIwddHB/Bp3K24eZVY1QY9mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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