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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ede58c6cf50dee6d7b8a5dda553f532e15715fdd6cf1e2e94a320b1cc140b1' 
  AND token = 'KHi/XosUygs0r60ut9m1d/DeaZYpCoyGV/060ImUQug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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