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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd050d8613c624e56ca920a79535f5d1e34329445921d383caa710b16ddf52aa' 
  AND token = 'oo18k9LeXeR8L77rAA8zLmycv/X+UJA+TxAZRUJmyq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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