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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d504957c68339a167317441a1f0495dbd22a25b38a4d4e53d96060d5a1cd6ad' 
  AND token = 'HB7h55GNNsIDxi8bjtG5EOVyS4vd1RwT22QEDrAo1/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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