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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6d11ea5aca4d57bbc5a10b21f7dd1b825944f6da41a1b72db374d699086953' 
  AND token = 'jm13XEqbSdJFmRmDDr9MgGhEr0csJF9nOTDFL5RPmfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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