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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3396720eba0142c91b6cdfe5cbe8afeac6bf7b0bbf83089ccb35e76fa6a71f' 
  AND token = '5En5JCW/iMzMCqk+TxMVYLqxh6f+u9ETFqKPq1X9PaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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