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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ece81af5376549686026b0c7e1a55984f62bb367d4c66adfb49e5050bedbff' 
  AND token = 'W1HH56bj/oqQCWWspmWcbTVvh5rRDLC56L2Z/oOrIHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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