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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673f55c734950720773fa9dc0340c04aa721ac56b91d90f002fed4aec6f5da21' 
  AND token = 'OlgC6Vv10SyKZQ1JE+nuDT7MwCE8C19cdoMDrOKhfq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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