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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bc76b74fbc699910cf113e4ec25bb5ff2fc1d6020912ca35ad2a5bcc5ca541' 
  AND token = 'IjEzkRx6UJDau8yRelcsJk1cS1OFj45IRxgX1msPggE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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