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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92f9c258dc3c1e50a2f21a6c78883ddd40365f52a42e07ba672173572d48872' 
  AND token = 'irOuarmVwToo03A6Qae5tn9fbYY7qWhPMWxXOcZbkdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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