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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befefe541a3bedf78109c190fe35ac007425b3b18e2711ac299b241bce74d084' 
  AND token = 'VqN+MezYKCKyeuHjxK4BrGXaEMQllpaRdgj2I9a6Qeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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