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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64b30470ff625ccca87bcf03730dde763a6cb9428c8a357ffabf2824e9c297a' 
  AND token = 'xIdetEEByYKx7YjKaOrLH8teXvaLFiWqeyzdN9I9N9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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