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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeed1f41fbdbb6a9b85a741f136d418a0c4192000136c5fc3bb9d97fdb362bb' 
  AND token = '45N5rAqLxr+/nFeLfRevL/9ANQ/UeIGyLhkrkO2+hdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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