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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d601eedbdac1e10a05ad254e0290901eded43870a92b7e778f342dde8f2478' 
  AND token = 'KphnyQB0X0bDtp19VOPs6Tgcd2ktdXgEcUsfoof3g8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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