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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839678a59d637d5dc0f97bf9a8f2007e35d2163e663d2d8cd3d2ce079f82416b' 
  AND token = 'daINIcfO8mdhOEtUgnDgxyFx3vImKtpuvm0HhnCxWQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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