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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082962db955ef24e58e821d31c17b1bb1002a8b61b7d50a643367cb38a4c74b8' 
  AND token = 'n4zY+D2b1Q8twkiTH46jXce52dhQHga+QV7cDo6znxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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