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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcd799cd35c0b09d084c81470f139e2b8139cba8768c2b96fb7fad09433816f' 
  AND token = 'uzk7vhzMRWDfD2T1KVWpj9x/XJ7j9wCqz6kpa9PRAME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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