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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141061731bdd986f912b9a6e89a71d77ff435c76602a43abd11426c4aa24fff6' 
  AND token = 'RaF+PJ6KVOedrbWR/ZDKVW1q+EIGyTtG7/CtT075hsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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