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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f55e2d3c9407141a73c16188192f4b8ff128896af9a99df8e09b8110836ee4' 
  AND token = 'M7zjr2slvhcG9GsoO5cFDgiUSx85YI5wiU+G7TDFiWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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