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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41226ef91ffbd2a113fafd1e8008eb1b72004c0d28bcfa12711d9fec23cd7b1' 
  AND token = '8Obk9HxCpVkp8MWnld4ZuNepsuTuLoH4yN8BLMcMXEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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