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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3c11c809a00c3af78a3de76c8a30d0feb204cab6c4b7c240a7496cc7ae0a27' 
  AND token = 'lm6BcSs+Qr5rt+IMwQ/fQPb1dF8ITj8IkXdGAlvaZXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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