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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8f2450e1234fd769681337641fa17170efd99004f9c516944952fc5c5b0484' 
  AND token = '6TcWOO/47hTEpBOiExrz8yynVuJBBwiBGsX/uNcGUXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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