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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0469fb010db614e5a9325ae858b6cbd3f536829fa63a59480119650aed3ab611' 
  AND token = 'lRyZPGCja14yJ+MmtvT4TI25euqx0ZvbRSY0YCL2Oq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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