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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69575b8ceff34c869891695692e0c39fa7d395efe2bc03b0ca708ca931284e0c' 
  AND token = 'BDrVJ8tv2bNo8XS8+BKPnb8Ne17zju4S/SuAJqyJgis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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