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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16d04e4474f9aefd8c7f9219c31143346540fe87210b5fd43c038c1dff37c9e' 
  AND token = 'LzifXgBkX8HCMoIt5qD7AwJ4b9CGEgqVfVwLSRCM1tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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