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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef79b4ffdab92a4d8e264cdb88885572b8bad35f79b8fb33f5459e106d972e84' 
  AND token = 'JYufibRUNaI0hRjJobmExkji0Iz2DIYI4CJGm2saUt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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