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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf92c6c578e08cdd23ed7f854faa3c203d5f07f4e1e8b22836b4eb6f91f679d5' 
  AND token = 'wphRUL18kGdgztbYFgENZBb8yX4Ur0DMLC08A/1qJ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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